package com.nowcoder.community.controller.interceptor;

import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CookieUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

/**
 * <p>Title: LoginTicketInterceptor</p>
 * <p>author 12427</p>
 *
 * @version ver1.0
 * @date 2022/7/22 16:15
 */
@Component
public class LoginTicketInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService ;

    @Autowired
    private HostHolder hostHolder ;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 从cookie获取ticket
        String ticket = CookieUtil.getValue(request,"ticket") ;
        if(ticket != null) {
            // 查询凭证
            LoginTicket loginTicket = userService.findLoginTicket(ticket);
            // 查询凭证是否有效
            if(loginTicket != null && loginTicket.getStatus() == 0 && loginTicket.getExpired().after(new Date())) {
                User user = userService.findUserById(loginTicket.getUserId());
                // 在本次请求中持有用户
                hostHolder.setUser(user);

                // 构建用户认证结果，存入SecurityContext，便于Security进行授权
                Authentication authentication = new UsernamePasswordAuthenticationToken(
                        // principal: 主要信息; credentials: 证书; authorities: 权限;
                    user ,user.getPassword() , userService.getAuthorities(user.getId())
                );
                SecurityContextHolder.setContext(new SecurityContextImpl(authentication));
            }
        }
        return true ;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        User user = hostHolder.getUser() ;
        if(user != null && modelAndView != null) {
            modelAndView.addObject("loginUser" , user) ;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        hostHolder.clear();
    }
}
